Calculating machine



July 7, 1936.

s. HILDER CALCULATING MACHINE 5 Sheet-Sheet 1 Filed Aug. 27, 1955 ENVENTOR July 7, 1936. s HILDER 2,046,820

CALCULATING MACHINE Filed Aug. 2'7, 1955 5 Sheets-Sheet 2 HN'JENTQR 5 Sheets-Sheet 5 Filed Aug. 27, 1955 INVENTOR Patented July 7, 1936 I PATENT OFFICE CALCULATING MACHINE Stuart Hilder, Glencarlyn, Va.,

assignor Monroe Calculating Machine Company, ,Orange, N. J., a corporation of Delaware Application August 27, 1935, Serial No. 38,043

3 Claims.

The invention has relation to calculatingmachines, and more particularly to means for releasing the depressed digit keys of a key set calculating machine at the end of an operation. United States Patent No. 2,010,068 issued on August 6, 1935 to Harvie J. Duke, discloses means for releasing the depressed digit keys of an adding machine at the end of an operation comprising one or more cycles of continuous registration. The present invention is applied to a calculating machine capable of performing plural order registrations, wherein multiplication and division, involving registration in several ordinally shifted positions of the register carriage,

and the shifting of said carriage from one posi, tion to another, is performed at a single operation. This involves a termination of the registration in each ordinal position, and the present invention is designed to release the keys: during such an operation only at the end of the complete computation, irrespective of intermediate interruptions of the register actuating device.

' Theinvention consists in the novel-construo-.

tion and combination of parts, as "set forth in the appended claims.

The invention is shown as applied to a calculating machine of the Monroe type, illustrated in United States Patent No. 1,566,650, issued to George C. Chase, on December 22, 1925; in application Serial No. 213,637, filed by George C. Chase on August 17, 1927, and in Patent No. 1,964,211, issued to Austin A. Overbury, on June 26, 1934.

In the accompanying drawings, illustrating the invention:

Fig.1 is a left side view of a calculating machine embodying the invention, with the casing broken away and parts shown'in their position of rest. Fig. 2 is an enlarged left side elevation of certain mechanism illustrated in Fig. 1, the parts being shown in the position assumed upon movement of the division'lever to operative position. Fig. 3 is a section, taken on line 3-3 of Fig. 2. Fig. 4 is a detail view of the key release lever and associated parts.

Operation control As fully described in the above named patents, the diflerential numeral wheel actuators of the machine are driven by an electric motor, through a planetary gear clutching and transmission mechanism, controlled by a clutch lever I I I, movable from an intermediate, inactive position into engagement with addition members I01, or opister subtractively on the are mounled, is connected link 27' with a rock lever 22,

positely into engagement with subtraction members IIO of the planetary. train. Upon engagement of clutch lever I II with member I0I, the numeral wheels I3 of the machine, mounted in an ordinally shiftable carriage 2, will be rotated for- 5 wardly, to register additively amounts set by the keys IB into the diiferential actuators. Engagement of clutch lever III with the member H0 will effect a reverse rotation of the parts, to regwheels I3. At the end of an operation, the clutch is disengaged and'the differential actuators brought to rest as follows:- Shaft 4, on which the difierential actuators by crankarm 20 and 15 said rock lever being reciprocated during the rotation of. the actuators. A stop arm 24 is mounted co-axially with lever 22, and is provided with a spring pawl 25, normally I held out of the path of lever 22 by the action of spring 28 (Fig. 4) and trigger 3i. Trigger 3| being released at the end of the operation, pawl will be moved by its spring into the path of movement of rock lever 22, whereby arm 24 will be carried forwardly with lever 22, so that rearward extension I44 of arm 24 will rise, a pin I45 in said extension camming clutch lever III into neutral position. Movement of arm 24', and therefore of the differential actuators, is resisted by spring 28, and limited by engagement of the arm with a fixed stop 29 (Fig. 4). After engagement with stop 29 the parts will be restored by spring 28 into full cycle. position of. the differential actuators. A lever200 serves to locate the actuators accurately and to lock them in full cycle position, this lever being raised, against the tension of its spring by a lever I34-and link 2I4, which lever is rocked in counterclockwise direction as seen in Figs. 1 and 2, upon depression of a motor key, and is allowed clockwise movement upon manual release of such key. Lever 200 is secured in raised position by a latch 204, this latch being released at the end of the operation by a pin 205 on stop arm 24. The forward end of lever I34 is provided with a pawl I36, operable to-engage and trip the trigger 3| upon release of the'motor key.

Setting of the division lever 20I effects the engagement of a clutch 63 in the train of mechanism whereby register carriage 2 is shifted, and also, through a pin 305 on said lever, engaging a cam surface 304, rocks a lever 303, which lever will engage and lift lever 200 out of locking position. Lever 20I is also provided with means'for throwing clutch lever III into subtract position, 55

and for projecting a tooth 209, mounted on said lever, into position to cooperate with a reversing tooth of link 2|.

subtractive registration having thus been started, a divisor set up on the keys I8 will be repeatedly subtracted from a dividened registered on wheels I3, untilthe registration upon said Wheels becomes negative, whereupon a pin 9 on a wheel l3 located to the left of the keyboard, will trip trigger 3| and efiect movement of the stop arm 24. This will cause. disengagement of the clutch and a rebound of the differential actuators from their over-run'beyond full cycle position, this rebound movement carrying the reversing tooth of link 2| against the end of tooth 209 (which has been centralized with the clutch lever), causing movement of clutch lever II| into its additive position.

A single cycle of additive rotation of the actutrip trigger 3|, centralizing the clutch lever whereupon the tooth of link 2 I moving in opposite direction, will, through tooth 209, throw clutch lever |I| into subtracting position. During this movement of arm 24, to reverse the drive from additive to subtractive rotation, the register carriage 2 will be shifted one ordinal place towards the left, by means of a push rod 41 pivoted to arm 24, lever 52, link 51, lever 55, etc., acting through the clutch 63 to give the carriage shifting shaft 46 a half rotation and thereby, through the well known crank pin arrangement, to shift the carriage. Push rod 41 cooperates with a pin 50 on link 2| in effecting the shift, pin 50 being in a different position upon reversal from subtraction to addition, and therefore not holding push rod 41 against the cooperating stud of lever 52.

During the above described movements of the parts lever 303 acts to hold lock lever 200 in raised or inactive position but, upon completion of the quotient figure registration following the retraction of division lever 20|, lock lever 200 will be allowed to fall, and the machine will be brought thrown into additive position, whereupon a pin 3 I 0, secured in tooth 209, will be moved from position shown in' Fig. 2 to the position shown in Fig. 1, said pin now lying in the path of movement of a cam tooth 309 of arm 301, pivoted upon the lever 303. Arm 301 is provided with a foot 308 overlying the pin I45, so that each forward movement of stop arm 24 will act to lift arm 391 toward the pin 3I0. So long as pin 3l0 remains in position shown in Fig. 2, tooth 309 will move idly past the pin, but when pin 3|0 is in position shown in Fig. 1', upward movement of arm 301 will bring tooth 309 against said pin, resulting in a forward camming movement of arm 301 and in clockwise rotation of lever 303. as seen in Figs. 1 and 2. This will disengage lever 303 from lock lever 200, which lever will fall, under the influence of its spring, lyingon top of link 2| until the actuators have returned to full cycle position, whereupon lever 200 will drop in front of link 2| locking the machine against rotation. There will be no attempt to throw the clutch lever ill into subtractive position at this time, because of the retraction of tooth 209 out of the path of movement of link 2|. Therefore the above described parts, which have effected a reversal during the division computation, have now acted in their normal manner, similar to the action fol- I Automatic key release The keys I8 are provided with notches (Fig. 3) engageable by spring locking bails 6, these bails extending each along the stems of the keys of a single column of the machine. Upon depression of a key, the related bail 6 will be cammed outwardly and then allowed to drop into the notch of the key stem, serving to hold the key in depressed position against the tension of the key spring. A key release slide 23 extends at right angles to the bails 6, and is provided with lugs engaging said bails. left, as seen in Fig. 3, will therefore effect release of all depressed keys l8.

A releasing lever 86, fulcrumed upon the frame of the machine, is provided with an arm lying in the path of movement of the stop arm 24, the opposite arm of said lever being adapted to engage a lug of bar 81, pivoted at 88 upon the slide 23.

. Bar 81 is held in the path of movement of lever 86 by a spring 89, and as shown this spring is attached at its other end to an arm of the lever 86, and said lever engages a lug of slide 23, so that spring'B9 serves to return lever 86 to normal position after operation, the lug acting as a stop for said lever.

Bar 81 is engaged by a link (Figs. 2 and 3) secured upon the lock lever 290, so that upon lifting of saidlock lever to the inactive position shown in Fig. 2, bar 81 will be lifted out of the path of movement of lever 86.

It will be noted that at the end of any operation, whether addition, subtraction, multiplication or division, lock lever 200 will be allowed to drop on top of link 2|, and this action is immediately followed by the contact of stop arm 24 ,,with the fixed stop 29. Therefore, at the end of every operation, bar 81 will be dropped into active position, and thereafter, and immediately before engagement of arm 24 with stop 29 (Fig. 4). said arm will engage and'operate lever 86 to clear the keyboard. It is also to be noted that during the operation of stop arm 24 to reverse the character of the registration during a division computation, lever 86 will be operated, but, bar 81 beingheld out of its path of movement, the keys will remain in set position.

In order that the machine may be operated and brought to rest without clearing the keyboard, if desired, a key 9| is provided, having engagement with a lever 92, fulcrumed upon the slide 23 and having its free end underlying a lug of the bar 81. When key 9| is depressed and latched in depressed position by engagement of lug '93 with the bottom of the keyboard plate, bar 81 will be held free of lever 86. Key 9| is normally held in raised position by its spring means.

I claim:

1. In a calculating machine, the combination with an ordinally shiftable carriage, numeral wheels thereon, a keyboard, means for registering upon said numeral wheels amounts set up on Movement of slide 23 to the said keyboard, and means for controlling a plural 76 order registration including power driven devices for terminating the registration in successive ordinal positions of said carriage and a device normally restrained during operation of said power driven devices and alternatively operable therewith to bring the machine to rest; of keyboard clearing means including a power transmission element held inoperative by said restrained device and movable in the alternative operation of said device into position to connect the power driven devices with the clearing means.

2. In a calculating machine, the combination I with an ordinally shiftable carriage, numeral wheels thereon, a keyboard, means for registeringupon said'numeral wheels amountsset up on said keyboard, and means for controlling a plural order registration including power driven devices for terminating the registration in successive ordinal positions of said carriage and a device normally restrained during operation of said power driven devices and alternatively operable therewith to bring the machine to rest; ofvkeyboard clearing means including a power transmission element held inoperative by said restrained device and movable in the alternative operation of said device into position to connect the power driven devices with the clearing means, and means' manually adjustable to hold said power transmission element inoperable.

3. In a calculating machine, the combination with an ordinally shiftable carriage, numeral wheels thereon, a keyboard, means for registering upon said numeral wheels amounts set up on said keyboard, and means for controlling a plural order registration including power driven devices for terminating the registration in successive ordinal positions of said carriage and a device normally restrained during operation of said ment of the lever by said restrained device and movable in the alternative operation of said device into said path.

' STUART HILDER. 

